Rolln Clean Self Cleaning Litter Box Using a unique patented grill system the Rolln Clean Self Cleaning Litter Box scoops out waste and deposits it into a slide-out tray. All you do is roll it onto its top roll it back to upright remove the tray and discard the mess. You wont believe how easy it is to keep a cleaner more sanitary litter box. Features: Award winning design So easy! Just roll it replace it and get rid of the waste Durable plastic construction Easy to clean and sanitize Recommended for use with clumping cat litter Available in two sizes; Regular for the average cat and Large for big cats or multiple cat households Item Specifications: Size: Regular (17"L x 20"W x 18"H) Large (19.5"L x 22"W x 20"H) Color: Assorted